IIRC the SoC they're using, and specifically the VC4 GPU portion which contains the memory controller, only supports 30-bit physical addresses so they'd have to

IIRC the SoC they're using, and specifically the VC4 GPU portion which contains the memory controller, only supports 30-bit physical addresses so they'd have to move to a new SoC/GPU to increase the memory beyond 1 GB. The good news is that it looks like Broadcom is developing a new "VC5" GPU (with open-source drivers[1]) but there's no telling when that would make it in to a shipping product. [1]: https://anholt.github.io/twivc4/2017/07/10/twiv/ https://anholt.github.io/twivc4/2017/07/10/twiv/